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Author mark.dickinson
Recipients koobs, mark.dickinson, vstinner
Date 2017-04-20.18:52:16
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1492714336.27.0.224705825002.issue30104@psf.upfronthosting.co.za>
In-reply-to
Content 
Hmm. Just looked at dto5.c; nice work reducing it to something so simple.

This is looking a bit like either a strict-aliasing related problem, or a compiler bug, or both. My understanding of the "union trick" that dtoa.c uses is that it's well-defined under C99+TC3 (though that wasn't clear under the original C99), so it shouldn't be legitimate for an optimisation to cause different results to be produced.

So this is smelling like a compiler bug to me.
History
Date User Action Args
2017-04-20 18:52:16mark.dickinsonsetrecipients: + mark.dickinson, vstinner, koobs
2017-04-20 18:52:16mark.dickinsonsetmessageid: <1492714336.27.0.224705825002.issue30104@psf.upfronthosting.co.za>
2017-04-20 18:52:16mark.dickinsonlinkissue30104 messages
2017-04-20 18:52:16mark.dickinsoncreate